<?php
	
	if($inputColor == "") {
		$inputColor = "FFFFFF";
	}

	echo "<body bgcolor='#$inputColor'>";
?>
	<form action="?" method="post">
		<input type="text" name="inputColor" value="<?php echo $inputColor; ?>">
		<input type="submit" name="submit" value="提交按钮">
	</form>
</body>